| La nemica | 1952 | Screenplay |
| Cent mille dollars pour Lassiter | 1966 | Screenplay |
| Requiem per un agente segreto | 1966 | Screenplay |
| Colorado | 1967 | Screenplay |
| ..4..3..2..1.. Objectif Lune | 1967 | Screenplay |
| Eine Handvoll Helden | 1967 | Writer |
| Le Dernier Face à face | 1967 | Screenplay |
| Sette volte sette | 1968 | Writer |
| Persecución hasta Valencia | 1968 | Screenplay |
| Rebus | 1968 | Screenplay |
| Il était une fois dans l'Ouest | 1968 | Screenplay |
| Concerto per pistola solista | 1970 | Screenplay |
| Un polyvalent pas comme les autres | 1971 | Writer |
| Il était une fois… la révolution | 1971 | Screenplay |
| Méfie-toi Ben, Charlie veut ta peau | 1972 | Screenplay |
| Viol en première page | 1972 | Screenplay |
| Les Enfants de chœur | 1973 | Screenplay |
| Il maschio ruspante | 1973 | Writer |
| Ming, ragazzi! | 1973 | Screenplay |
| L'Homme aux nerfs d'acier | 1973 | Screenplay |
| Deux grandes gueules | 1974 | Screenplay |
| La poliziotta | 1974 | Screenplay |
| Dîtes le avec des oignons | 1975 | Screenplay |
| Il padrone e l'operaio | 1975 | Screenplay |
| L'Italia s'è Rotta | 1976 | Screenplay |
| Criminalia | 1977 | Screenplay |
| Orca | 1977 | Screenplay |
| Holocauste 2000 | 1977 | Screenplay |
| Le Continent des hommes-poissons | 1979 | Screenplay |
| Un Jouet dangereux | 1979 | Screenplay |
| Duri a morire | 1979 | Writer |
| On m'appelle Malabar | 1981 | Screenplay |
| Il conte Tacchia | 1982 | Screenplay |
| Les Aventures de Miss Catastrophe | 1983 | Screenplay |
| I Paladini. Storia d'armi e d'amori | 1983 | Screenplay |
| A tu per tu | 1984 | Screenplay |
| Casablanca, Casablanca | 1985 | Screenplay |
| Man on Fire | 1987 | Screenplay |
| Sotto il vestito niente II | 1988 | Screenplay |
| Blowing Hot and Cold | 1989 | Screenplay |
| Seul face au crime | 1991 | Writer |
| Beyond Justice | 1992 | Writer |
| Grand Nord | 1996 | Writer |
| Senza Movente | 1999 | Writer |
| Almost Blue | 2000 | Screenplay |
| La Sicilienne | 2008 | Writer |
